Wood burning furnace



FIG. 1 is a front elevational view of a wood burning furnace showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof.

The bottom surface of the device is substantially planar and unornamented. 

The ornamental design for a wood burning furnace, as shown and described. 